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Hi. This sounds like the water pump is not circulating the antifreeze in the engine. When a water pump stops circulating the antifreeze as well as it should the car tends to run hot when it is at idle and cooler when you are moving because you increase the engine speed while moving causing the water pump to increase its speed. Another possibility is that the radiator is clogged and causing the flow of coolant to be restricted. I suggest you having a certified technician from YourMechanic come and diagnose your cars overheating condition to avoid any necessary repairs.

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